Fix router ASP.NET request body binding

src/Router/__Tests/StellaOps.Router.AspNet.Tests/AspNetRouterRequestDispatcherTests.cs

@@ -1,4 +1,5 @@
 using System.Text;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.AspNetCore.Routing.Matching;
@@ -103,6 +104,100 @@ public sealed class AspNetRouterRequestDispatcherTests
         Assert.Equal("alice", Encoding.UTF8.GetString(response.Payload.ToArray()));
     }
 
+    [Fact]
+    public async Task DispatchAsync_RoundTrippedLowercaseContentType_PreservesJsonRequestMetadata()
+    {
+        var routeEndpoint = new RouteEndpoint(
+            async context =>
+            {
+                using var reader = new StreamReader(context.Request.Body, Encoding.UTF8, leaveOpen: true);
+                var body = await reader.ReadToEndAsync();
+                var isJson = string.Equals(context.Request.ContentType, "application/json", StringComparison.OrdinalIgnoreCase);
+
+                context.Response.StatusCode = isJson && body == "{\"name\":\"stella\"}"
+                    ? StatusCodes.Status200OK
+                    : StatusCodes.Status400BadRequest;
+            },
+            RoutePatternFactory.Parse("/api/v1/context/preferences"),
+            order: 0,
+            new EndpointMetadataCollection(new HttpMethodMetadata(["PUT"])),
+            displayName: "Preferences");
+
+        var dispatcher = CreateDispatcher(
+            routeEndpoint,
+            new StellaRouterBridgeOptions
+            {
+                ServiceName = "platform",
+                Version = "1.0.0-alpha1",
+                Region = "local",
+                AuthorizationTrustMode = GatewayAuthorizationTrustMode.ServiceEnforced
+            });
+
+        var transportFrame = FrameConverter.ToFrame(new RequestFrame
+        {
+            RequestId = "req-3",
+            Method = "PUT",
+            Path = "/api/v1/context/preferences",
+            Headers = new Dictionary<string, string>
+            {
+                ["content-type"] = "application/json"
+            },
+            Payload = Encoding.UTF8.GetBytes("{\"name\":\"stella\"}")
+        });
+
+        var roundTrippedRequest = FrameConverter.ToRequestFrame(transportFrame);
+        Assert.NotNull(roundTrippedRequest);
+
+        var response = await dispatcher.DispatchAsync(roundTrippedRequest!);
+
+        Assert.Equal(StatusCodes.Status200OK, response.StatusCode);
+    }
+
+    [Fact]
+    public async Task DispatchAsync_RoundTrippedLowercaseContentType_BindsMinimalApiJsonBody()
+    {
+        var builder = WebApplication.CreateBuilder();
+        var app = builder.Build();
+        app.MapPut("/api/v1/context/preferences", (PreferencesBody body) => Results.Ok(body));
+
+        var endpointRouteBuilder = (IEndpointRouteBuilder)app;
+        var endpointDataSource = new StaticEndpointDataSource(
+            endpointRouteBuilder.DataSources.SelectMany(static dataSource => dataSource.Endpoints).ToArray());
+        var dispatcher = new AspNetRouterRequestDispatcher(
+            app.Services,
+            endpointDataSource,
+            new StellaRouterBridgeOptions
+            {
+                ServiceName = "platform",
+                Version = "1.0.0-alpha1",
+                Region = "local",
+                AuthorizationTrustMode = GatewayAuthorizationTrustMode.ServiceEnforced
+            },
+            NullLogger<AspNetRouterRequestDispatcher>.Instance);
+
+        var transportFrame = FrameConverter.ToFrame(new RequestFrame
+        {
+            RequestId = "req-4",
+            Method = "PUT",
+            Path = "/api/v1/context/preferences",
+            Headers = new Dictionary<string, string>
+            {
+                ["content-type"] = "application/json"
+            },
+            Payload = Encoding.UTF8.GetBytes("{\"regions\":[],\"environments\":[\"dev\"],\"timeWindow\":\"24h\"}")
+        });
+
+        var roundTrippedRequest = FrameConverter.ToRequestFrame(transportFrame);
+        Assert.NotNull(roundTrippedRequest);
+
+        var response = await dispatcher.DispatchAsync(roundTrippedRequest!);
+        var responseBody = Encoding.UTF8.GetString(response.Payload.ToArray());
+
+        Assert.Equal(StatusCodes.Status200OK, response.StatusCode);
+        Assert.Contains("\"environments\":[\"dev\"]", responseBody, StringComparison.Ordinal);
+        Assert.Contains("\"timeWindow\":\"24h\"", responseBody, StringComparison.Ordinal);
+    }
+
     private static AspNetRouterRequestDispatcher CreateDispatcher(RouteEndpoint endpoint, StellaRouterBridgeOptions options)
     {
         var services = new ServiceCollection();
@@ -130,4 +225,6 @@ public sealed class AspNetRouterRequestDispatcherTests
     {
         public override Task SelectAsync(HttpContext httpContext, CandidateSet candidates) => Task.CompletedTask;
     }
+
+    private sealed record PreferencesBody(string[] Regions, string[] Environments, string TimeWindow);
 }

src/Router/__Tests/StellaOps.Router.AspNet.Tests/TASKS.md

@@ -7,3 +7,4 @@ Source of truth: `docs/implplan/SPRINT_20260130_002_Tools_csproj_remediation_sol
 | RVM-02 | DONE | Added `AddRouterMicroservice()` DI tests for disabled mode, gateway validation, TCP registration, and Valkey messaging options wiring via plugin-based transport activation; extended ASP.NET discovery tests for OpenAPI metadata/schema extraction and typed response-schema selection fallback. |
 | REMED-05 | TODO | Remediation checklist: docs/implplan/audits/csproj-standards/remediation/checklists/src/Router/__Tests/StellaOps.Router.AspNet.Tests/StellaOps.Router.AspNet.Tests.md. |
 | REMED-06 | DONE | SOLID review notes captured for SPRINT_20260130_002. |
+| HDR-CASE-01 | DONE | Added the lowercase `content-type` request-frame regression so JSON body dispatch survives Router frame round-trips. |